[Nightblood.]

It really depends on what drug, how much, how often, your mental state, if you have mental illness, etc. Caffeine is considered a drug, though it is totally legal and for the most part safe. Alcohol is also a drug. Some drugs aren't physically addicting, but some are. Alcohol is physically addicting. However, a drug doesn't have to be physically addicting for it to negatively impact your life. Psychological addictions can be almost as bad. It's not worth the risk, especially at 16. And while it may be easy to think you won't become addicted to something, no addict ever started doing drugs thinking "I'm going to become an addict and this is going to ruin my life." Addiction tends to start small and spiral out of control and sometimes you don't even realize it.